Techniques for resource selection in a wireless communication system

ABSTRACT

In an aspect, the present disclosure includes a method, apparatus, and computer readable medium for wireless communications for receiving, by a first user equipment (UE) from one or more second UEs via a control channel, one or more reserved resources in time associated with any of the one or more second UE; determining, by the first UE, one or more transmission resources to reserve based on the one or more reserved resources in time; and transmitting, by the first UE to the one or more second UEs, data using the one or more reserved transmission resources.

CROSS-REFERENCE TO RELATED APPLICATION(S)

The present application claims benefit of U.S. Provisional ApplicationNo. 62/951,644 entitled “TECHNIQUES FOR RESOURCE SELECTION IN A WIRELESSCOMMUNICATION SYSTEM” filed Dec. 20, 2019, which is assigned to theassignee hereof and hereby expressly incorporated by reference herein.

BACKGROUND

The present disclosure relates generally to communication systems, andmore particularly, to improved resource selection for semi-persistentscheduling (SPS) in fifth generation new radio (5G NR)vehicle-to-everything (V2X).

Wireless communication systems are widely deployed to provide varioustelecommunication services such as telephony, video, data, messaging,and broadcasts. Typical wireless communication systems may employmultiple-access technologies capable of supporting communication withmultiple users by sharing available system resources. Examples of suchmultiple-access technologies include code division multiple access(CDMA) systems, time division multiple access (TDMA) systems, frequencydivision multiple access (FDMA) systems, orthogonal frequency divisionmultiple access (OFDMA) systems, single-carrier frequency divisionmultiple access (SC-FDMA) systems, and time division synchronous codedivision multiple access (TD-SCDMA) systems.

These multiple access technologies have been adopted in varioustelecommunication standards to provide a common protocol that enablesdifferent wireless devices to communicate on a municipal, national,regional, and even global level. An example telecommunication standardis 5G New Radio (NR). 5G NR is part of a continuous mobile broadbandevolution promulgated by Third Generation Partnership Project (3GPP) tomeet new requirements associated with latency, reliability, security,scalability (e.g., with Internet of Things (IoT)), and otherrequirements. 5G NR includes services associated with enhanced mobilebroadband (eMBB), massive machine type communications (mMTC), andultra-reliable low latency communications (URLLC). Some aspects of 5G NRmay be based on the 4G Long Term Evolution (LTE) standard. There existsa need for further improvements in 5G NR technology. These improvementsmay also be applicable to other multi-access technologies and thetelecommunication standards that employ these technologies.

Due to the increasing demand for wireless communications, there is adesire to improve the efficiency of wireless communication networktechniques.

SUMMARY

The following presents a simplified summary of one or more aspects inorder to provide a basic understanding of such aspects. This summary isnot an extensive overview of all contemplated aspects, and is intendedto neither identify key or critical elements of all aspects nordelineate the scope of any or all aspects. Its sole purpose is topresent some concepts of one or more aspects in a simplified form as aprelude to the more detailed description that is presented later.

An example implementation includes a method of wireless communication,including receiving, by a first user equipment (UE) from one or moresecond UEs via a control channel, one or more reserved resources in timeassociated with any of the one or more second UE; determining, by thefirst UE, one or more transmission resources to reserve based on the oneor more reserved resources in time; and transmitting, by the first UE tothe one or more second UEs, data using the one or more reservedtransmission resources.

In a further example, an apparatus for wireless communication isprovided that includes a transceiver, a memory configured to storeinstructions, and one or more processors communicatively coupled withthe transceiver and the memory. The one or more processors areconfigured to receive, by a first UE from one or more second UEs via acontrol channel, one or more reserved resources in time associated withany of the one or more second UE; determine, by the first UE, one ormore transmission resources to reserve based on the one or more reservedresources in time; and transmit, by the first UE to the one or moresecond UEs, data using the one or more reserved transmission resources.

In another aspect, an apparatus for wireless communication is providedthat includes means for receiving, by a first UE from one or more secondUEs via a control channel, one or more reserved resources in timeassociated with any of the one or more second UE; means for determining,by the first UE, one or more transmission resources to reserve based onthe one or more reserved resources in time; and means for transmitting,by the first UE to the one or more second UEs, data using the one ormore reserved transmission resources.

In yet another aspect, a non-transitory computer-readable medium isprovided including code executable by one or more processors to receive,by a first UE from one or more second UEs via a control channel, one ormore reserved resources in time associated with any of the one or moresecond UE; determine, by the first UE, one or more transmissionresources to reserve based on the one or more reserved resources intime; and transmit, by the first UE to the one or more second UEs, datausing the one or more reserved transmission resources.

To the accomplishment of the foregoing and related ends, the one or moreaspects comprise the features hereinafter fully described andparticularly pointed out in the claims. The following description andthe annexed drawings set forth in detail certain illustrative featuresof the one or more aspects. These features are indicative, however, ofbut a few of the various ways in which the principles of various aspectsmay be employed, and this description is intended to include all suchaspects and their equivalents.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a diagram illustrating an example of a wireless communicationssystem and an access network.

FIGS. 2A, 2B, 2C, and 2D are diagrams illustrating examples of a first5G/NR frame, DL channels within a 5G/NR subframe, a second 5G/NR frame,and UL channels within a 5G/NR subframe, respectively.

FIG. 3 is a diagram illustrating an example of a base station and userequipment (UE) in an access network.

FIG. 4 is a flowchart of a method of wireless communication, and morespecifically reserving resources for V2X communications.

FIG. 5 is a block diagram illustrating an example of a UE, in accordancewith various aspects of the present disclosure.

FIG. 6 is a block diagram illustrating an example of a base station, inaccordance with various aspects of the present disclosure.

DETAILED DESCRIPTION

The detailed description set forth below in connection with the appendeddrawings is intended as a description of various configurations and isnot intended to represent the only configurations in which the conceptsdescribed herein may be practiced. The detailed description includesspecific details for the purpose of providing a thorough understandingof various concepts. However, it will be apparent to those skilled inthe art that these concepts may be practiced without these specificdetails. In some instances, well known structures and components areshown in block diagram form in order to avoid obscuring such concepts.

Several aspects of telecommunication systems will now be presented withreference to various apparatus and methods. These apparatus and methodswill be described in the following detailed description and illustratedin the accompanying drawings by various blocks, components, circuits,processes, algorithms, etc. (collectively referred to as “elements”).These elements may be implemented using electronic hardware, computersoftware, or any combination thereof. Whether such elements areimplemented as hardware or software depends upon the particularapplication and design constraints imposed on the overall system.

By way of example, an element, or any portion of an element, or anycombination of elements may be implemented as a “processing system” thatincludes one or more processors. Examples of processors includemicroprocessors, microcontrollers, graphics processing units (GPUs),central processing units (CPUs), application processors, digital signalprocessors (DSPs), reduced instruction set computing (RISC) processors,systems on a chip (SoC), baseband processors, field programmable gatearrays (FPGAs), programmable logic devices (PLDs), state machines, gatedlogic, discrete hardware circuits, and other suitable hardwareconfigured to perform the various functionality described throughoutthis disclosure. One or more processors in the processing system mayexecute software. Software may be construed broadly to meaninstructions, instruction sets, code, code segments, program code,programs, subprograms, software components, applications, softwareapplications, software packages, routines, subroutines, objects,executables, threads of execution, procedures, functions, etc., whetherreferred to as software, firmware, middleware, microcode, hardwaredescription language, or otherwise.

Accordingly, in one or more example embodiments, the functions describedmay be implemented in hardware, software, or any combination thereof. Ifimplemented in software, the functions may be stored on or encoded asone or more instructions or code on a computer-readable medium.Computer-readable media includes computer storage media. Storage mediamay be any available media that can be accessed by a computer. By way ofexample, and not limitation, such computer-readable media can comprise arandom-access memory (RAM), a read-only memory (ROM), an electricallyerasable programmable ROM (EEPROM), optical disk storage, magnetic diskstorage, other magnetic storage devices, combinations of theaforementioned types of computer-readable media, or any other mediumthat can be used to store computer executable code in the form ofinstructions or data structures that can be accessed by a computer.

FIG. 1 is a diagram illustrating an example of a wireless communicationssystem and an access network 100 configured for improved resourceselection for semi-persistent scheduling (SPS) in fifth generation newradio (5G NR) vehicle-to-everything (V2X). The wireless communicationssystem (also referred to as a wireless wide area network (WWAN))includes base stations 102, UEs 104, an Evolved Packet Core (EPC) 160,and another core network 190 (e.g., a 5G Core (5GC)).

In certain aspects, the UE 104 may be configured to operate acommunication component 198 and/or a configuration component 240 toreceive from one or more second UEs via a control channel, one or morereserved resources in time associated with any of the one or more secondUE. For example, the communication component 198 and/or a configurationcomponent 240 may be configured to determine one or more transmissionresources to reserve based on the one or more reserved resources intime, and transmit, to the one or more second UEs, data using the one ormore reserved transmission resources.

Correspondingly, in certain aspects, the network entity 102 (e.g., basestation) and/or another UE, such as UE 104, may be configured to operatea communication component 199 and/or a configuration component 241 toengage in a sidelink communication with UE 104. For example,communication component 199 and/or a configuration component 241 maytransmit one or more reserved resources in time to UE 104 and receiveone or more transmissions from UE 104 on one or more reservedtransmission resources.

The base stations 102 may include macrocells (high power cellular basestation) and/or small cells (low power cellular base station). Themacrocells include base stations. The small cells include femtocells,picocells, and microcells.

The base stations 102 configured for 4G LTE (collectively referred to asEvolved Universal Mobile Telecommunications System (UMTS) TerrestrialRadio Access Network (E-UTRAN)) may interface with the EPC 160 throughbackhaul links 132 (e.g., S1 interface). The base stations 102configured for 5G NR (collectively referred to as Next Generation RAN(NG-RAN)) may interface with core network 190 through backhaul links184. In addition to other functions, the base stations 102 may performone or more of the following functions: transfer of user data, radiochannel ciphering and deciphering, integrity protection, headercompression, mobility control functions (e.g., handover, dualconnectivity), inter-cell interference coordination, connection setupand release, load balancing, distribution for non-access stratum (NAS)messages, NAS node selection, synchronization, radio access network(RAN) sharing, multimedia broadcast multicast service (MBMS), subscriberand equipment trace, RAN information management (RIM), paging,positioning, and delivery of warning messages. The base stations 102 maycommunicate directly or indirectly (e.g., through the EPC 160 or corenetwork 190) with each other over backhaul links 134 (e.g., X2interface). The backhaul links 132, 134, and 184 may be wired orwireless.

The base stations 102 may wirelessly communicate with the UEs 104. Eachof the base stations 102 may provide communication coverage for arespective geographic coverage area 110. There may be overlappinggeographic coverage areas 110. For example, the small cell 102′ may havea coverage area 110′ that overlaps the coverage area 110 of one or moremacro base stations 102. A network that includes both small cell andmacrocells may be known as a heterogeneous network. A heterogeneousnetwork may also include Home Evolved Node Bs (eNBs) (HeNBs), which mayprovide service to a restricted group known as a closed subscriber group(CSG). The communication links 120 between the base stations 102 and theUEs 104 may include uplink (UL) (also referred to as reverse link)transmissions from a UE 104 to a base station 102 and/or downlink (DL)(also referred to as forward link) transmissions from a base station 102to a UE 104. The communication links 120 may use multiple-input andmultiple-output (MIMO) antenna technology, including spatialmultiplexing, beamforming, and/or transmit diversity. The communicationlinks may be through one or more carriers. The base stations 102/UEs 104may use spectrum up to Y MHz (e.g., 5, 10, 15, 20, 100, 400, etc. MHz)bandwidth per carrier allocated in a carrier aggregation of up to atotal of Yx MHz (x component carriers) used for transmission in eachdirection. The carriers may or may not be adjacent to each other.Allocation of carriers may be asymmetric with respect to DL and UL(e.g., more or fewer carriers may be allocated for DL than for UL). Thecomponent carriers may include a primary component carrier and one ormore secondary component carriers. A primary component carrier may bereferred to as a primary cell (PCell) and a secondary component carriermay be referred to as a secondary cell (SCell).

Certain UEs 104 may communicate with each other using device-to-device(D2D) communication link 158. The D2D communication link 158 may use theDL/UL WWAN spectrum. The D2D communication link 158 may use one or moresidelink channels, such as a physical sidelink broadcast channel(PSBCH), a physical sidelink discovery channel (PSDCH), a physicalsidelink shared channel (PSSCH), and a physical sidelink control channel(PSCCH). D2D communication may be through a variety of wireless D2Dcommunications systems, such as for example, FlashLinQ, WiMedia,Bluetooth, ZigBee, Wi-Fi based on the IEEE 802.11 standard, LTE, or NR.

The wireless communications system may further include a Wi-Fi accesspoint (AP) 150 in communication with Wi-Fi stations (STAs) 152 viacommunication links 154 in a 5 GHz unlicensed frequency spectrum. Whencommunicating in an unlicensed frequency spectrum, the STAs 152/AP 150may perform a clear channel assessment (CCA) prior to communicating inorder to determine whether the channel is available.

The small cell 102′ may operate in a licensed and/or an unlicensedfrequency spectrum. When operating in an unlicensed frequency spectrum,the small cell 102′ may employ NR and use the same 5 GHz unlicensedfrequency spectrum as used by the Wi-Fi AP 150. The small cell 102′,employing NR in an unlicensed frequency spectrum, may boost coverage toand/or increase capacity of the access network.

A base station 102, whether a small cell 102′ or a large cell (e.g.,macro base station), may include an eNB, gNodeB (gNB), or another typeof base station. Some base stations, such as gNB 180 may operate in atraditional sub 6 GHz spectrum, in millimeter wave (mmW) frequencies,and/or near mmW frequencies in communication with the UE 104. When thegNB 180 operates in mmW or near mmW frequencies, the gNB 180 may bereferred to as an mmW base station. Extremely high frequency (EHF) ispart of the RF in the electromagnetic spectrum. EHF has a range of 30GHz to 300 GHz and a wavelength between 1 millimeter and 10 millimeters.Radio waves in the band may be referred to as a millimeter wave. NearmmW may extend down to a frequency of 3 GHz with a wavelength of 100millimeters. The super high frequency (SHF) band extends between 3 GHzand 30 GHz, also referred to as centimeter wave. Communications usingthe mmW/near mmW radio frequency band (e.g., 3 GHz-300 GHz) hasextremely high path loss and a short range. The mmW base station 180 mayutilize beamforming 182 with the UE 104 to compensate for the extremelyhigh path loss and short range.

The base station 180 may transmit a beamformed signal to the UE 104 inone or more transmit directions 182′. The UE 104 may receive thebeamformed signal from the base station 180 in one or more receivedirections 182″. The UE 104 may also transmit a beamformed signal to thebase station 180 in one or more transmit directions. The base station180 may receive the beamformed signal from the UE 104 in one or morereceive directions. The base station 180/UE 104 may perform beamtraining to determine the best receive and transmit directions for eachof the base station 180/UE 104. The transmit and receive directions forthe base station 180 may or may not be the same. The transmit andreceive directions for the UE 104 may or may not be the same.

The EPC 160 may include a Mobility Management Entity (MME) 162, otherMMEs 164, a Serving Gateway 166, a Multimedia Broadcast MulticastService (MBMS) Gateway 168, a Broadcast Multicast Service Center (BM-SC)170, and a Packet Data Network (PDN) Gateway 172. The MME 162 may be incommunication with a Home Subscriber Server (HSS) 174. The MME 162 isthe control node that processes the signaling between the UEs 104 andthe EPC 160. Generally, the MME 162 provides bearer and connectionmanagement. All user Internet protocol (IP) packets are transferredthrough the Serving Gateway 166, which itself is connected to the PDNGateway 172. The PDN Gateway 172 provides UE IP address allocation aswell as other functions. The PDN Gateway 172 and the BM-SC 170 areconnected to the IP Services 176. The IP Services 176 may include theInternet, an intranet, an IP Multimedia Subsystem (IMS), a PS StreamingService, and/or other IP services. The BM-SC 170 may provide functionsfor MBMS user service provisioning and delivery. The BM-SC 170 may serveas an entry point for content provider MBMS transmission, may be used toauthorize and initiate MBMS Bearer Services within a public land mobilenetwork (PLMN), and may be used to schedule MBMS transmissions. The MBMSGateway 168 may be used to distribute MBMS traffic to the base stations102 belonging to a Multicast Broadcast Single Frequency Network (MBSFN)area broadcasting a particular service, and may be responsible forsession management (start/stop) and for collecting eMBMS relatedcharging information.

The core network 190 may include a Access and Mobility ManagementFunction (AMF) 192, other AMFs 193, a Session Management Function (SMF)194, and a User Plane Function (UPF) 195. The AMF 192 may be incommunication with a Unified Data Management (UDM) 196. The AMF 192 isthe control node that processes the signaling between the UEs 104 andthe core network 190. Generally, the AMF 192 provides QoS flow andsession management. All user Internet protocol (IP) packets aretransferred through the UPF 195. The UPF 195 provides UE IP addressallocation as well as other functions. The UPF 195 is connected to theIP Services 197. The IP Services 197 may include the Internet, anintranet, an IP Multimedia Subsystem (IMS), a PS Streaming Service,and/or other IP services.

The base station may also be referred to as a gNB, Node B, evolved NodeB (eNB), an access point, a base transceiver station, a radio basestation, a radio transceiver, a transceiver function, a basic serviceset (BSS), an extended service set (ESS), a transmit reception point(TRP), or some other suitable terminology. The base station 102 providesan access point to the EPC 160 or core network 190 for a UE 104.Examples of UEs 104 include a cellular phone, a smart phone, a sessioninitiation protocol (SIP) phone, a laptop, a personal digital assistant(PDA), a satellite radio, a global positioning system, a multimediadevice, a video device, a digital audio player (e.g., MP3 player), acamera, a game console, a tablet, a smart device, a wearable device, avehicle, an electric meter, a gas pump, a large or small kitchenappliance, a healthcare device, an implant, a sensor/actuator, adisplay, or any other similar functioning device. Some of the UEs 104may be referred to as IoT devices (e.g., parking meter, gas pump,toaster, vehicles, heart monitor, etc.). The UE 104 may also be referredto as a station, a mobile station, a subscriber station, a mobile unit,a subscriber unit, a wireless unit, a remote unit, a mobile device, awireless device, a wireless communications device, a remote device, amobile subscriber station, an access terminal, a mobile terminal, awireless terminal, a remote terminal, a handset, a user agent, a mobileclient, a client, or some other suitable terminology.

FIGS. 2A-2D include diagrams of example frame structures and resourcesthat may be utilized in communications between the base stations 102,the UEs 104, and/or the secondary UEs (or sidelink UEs) 110 described inthis disclosure. FIG. 2A is a diagram 200 illustrating an example of afirst subframe within a 5G/NR frame structure. FIG. 2B is a diagram 230illustrating an example of DL channels within a 5G/NR subframe. FIG. 2Cis a diagram 250 illustrating an example of a second subframe within a5G/NR frame structure. FIG. 2D is a diagram 280 illustrating an exampleof UL channels within a 5G/NR subframe. The 5G/NR frame structure may beFDD in which for a particular set of subcarriers (carrier systembandwidth), subframes within the set of subcarriers are dedicated foreither DL or UL, or may be TDD in which for a particular set ofsubcarriers (carrier system bandwidth), subframes within the set ofsubcarriers are dedicated for both DL and UL. In the examples providedby FIGS. 2A, 2C, the 5G/NR frame structure is assumed to be TDD, withsubframe 4 being configured with slot format 28 (with mostly DL), whereD is DL, U is UL, and X is flexible for use between DL/UL, and subframe3 being configured with slot format 34 (with mostly UL). While subframes3, 4 are shown with slot formats 34, 28, respectively, any particularsubframe may be configured with any of the various available slotformats 0-61. Slot formats 0, 1 are all DL, UL, respectively. Other slotformats 2-61 include a mix of DL, UL, and flexible symbols. UEs areconfigured with the slot format (dynamically through DL controlinformation (DCI), or semi-statically/statically through radio resourcecontrol (RRC) signaling) through a received slot format indicator (SFI).Note that the description infra applies also to a 5G/NR frame structurethat is TDD.

Other wireless communication technologies may have a different framestructure and/or different channels. A frame (10 ms) may be divided into10 equally sized subframes (1 ms). Each subframe may include one or moretime slots. Subframes may also include mini-slots, which may include 7,4, or 2 symbols. Each slot may include 7 or 14 symbols, depending on theslot configuration. For slot configuration 0, each slot may include 14symbols, and for slot configuration 1, each slot may include 7 symbols.The symbols on DL may be cyclic prefix (CP) OFDM (CP-OFDM) symbols. Thesymbols on UL may be CP-OFDM symbols (for high throughput scenarios) ordiscrete Fourier transform (DFT) spread OFDM (DFT-s-OFDM) symbols (alsoreferred to as single carrier frequency-division multiple access(SC-FDMA) symbols) (for power limited scenarios; limited to a singlestream transmission). The number of slots within a subframe is based onthe slot configuration and the numerology. For slot configuration 0,different numerologies μ 0 to 5 allow for 1, 2, 4, 8, 16, and 32 slots,respectively, per subframe. For slot configuration 1, differentnumerologies 0 to 2 allow for 2, 4, and 8 slots, respectively, persubframe. Accordingly, for slot configuration 0 and numerology μ, thereare 14 symbols/slot and 2^(μ) slots/subframe. The subcarrier spacing andsymbol length/duration are a function of the numerology. The subcarrierspacing may be equal to 2^(μ)*15 kHz, where μ is the numerology 0 to 5.As such, the numerology μ=0 has a subcarrier spacing of 15 kHz and thenumerology μ=5 has a subcarrier spacing of 480 kHz. The symbollength/duration is inversely related to the subcarrier spacing. FIGS.2A-2D provide an example of slot configuration 0 with 14 symbols perslot and numerology μ=0 with 1 slot per subframe. The subcarrier spacingis 15 kHz and symbol duration is approximately 66.7 μs.

A resource grid may be used to represent the frame structure. Each timeslot includes a resource block (RB) (also referred to as physical RBs(PRBs)) that extends 12 consecutive subcarriers. The resource grid isdivided into multiple resource elements (REs). The number of bitscarried by each RE depends on the modulation scheme.

As illustrated in FIG. 2A, some of the REs carry reference (pilot)signals (RS) for the UE. The RS may include demodulation RS (DM-RS)(indicated as R_(x) for one particular configuration, where 100 x is theport number, but other DM-RS configurations are possible) and channelstate information reference signals (CSI-RS) for channel estimation atthe UE. The RS may also include beam measurement RS (BRS), beamrefinement RS (BRRS), and phase tracking RS (PT-RS).

FIG. 2B illustrates an example of various DL channels within a subframeof a frame. The physical downlink control channel (PDCCH) carries DCIwithin one or more control channel elements (CCEs), each CCE includingnine RE groups (REGs), each REG including four consecutive REs in anOFDM symbol. A primary synchronization signal (PSS) may be within symbol2 of particular subframes of a frame. The PSS is used by a UE 104 todetermine subframe/symbol timing and a physical layer identity. Asecondary synchronization signal (SSS) may be within symbol 4 ofparticular subframes of a frame. The SSS is used by a UE to determine aphysical layer cell identity group number and radio frame timing. Basedon the physical layer identity and the physical layer cell identitygroup number, the UE can determine a physical cell identifier (PCI).Based on the PCI, the UE can determine the locations of theaforementioned DM-RS. The physical broadcast channel (PBCH), whichcarries a master information block (MIB), may be logically grouped withthe PSS and SSS to form a synchronization signal (SS)/PBCH block. TheMIB provides a number of RBs in the system bandwidth and a system framenumber (SFN). The physical downlink shared channel (PDSCH) carries userdata, broadcast system information not transmitted through the PBCH suchas system information blocks (SIBs), and paging messages.

As illustrated in FIG. 2C, some of the REs carry DM-RS (indicated as Rfor one particular configuration, but other DM-RS configurations arepossible) for channel estimation at the base station. The UE maytransmit DM-RS for the physical uplink control channel (PUCCH) and DM-RSfor the physical uplink shared channel (PUSCH). The PUSCH DM-RS may betransmitted in the first one or two symbols of the PUSCH. The PUCCHDM-RS may be transmitted in different configurations depending onwhether short or long PUCCHs are transmitted and depending on theparticular PUCCH format used. Although not shown, the UE may transmitsounding reference signals (SRS). The SRS may be used by a base stationfor channel quality estimation to enable frequency-dependent schedulingon the UL.

FIG. 2D illustrates an example of various UL channels within a subframeof a frame. The PUCCH may be located as indicated in one configuration.The PUCCH carries uplink control information (UCI), such as schedulingrequests, a channel quality indicator (CQI), a precoding matrixindicator (PMI), a rank indicator (RI), and HARQ ACK/NACK feedback. ThePUSCH carries data, and may additionally be used to carry a bufferstatus report (BSR), a power headroom report (PHR), and/or UCI.

FIG. 3 is a block diagram of a base station 310 in communication with aUE 350 in an access network, where the base station 310 may be anexample implementation of base station 102 and where UE 350 may be anexample implementation of UE 104. In the DL, IP packets from the EPC 160may be provided to a controller/processor 375. The controller/processor375 implements layer 3 and layer 2 functionality. Layer 3 includes aradio resource control (RRC) layer, and layer 2 includes a service dataadaptation protocol (SDAP) layer, a packet data convergence protocol(PDCP) layer, a radio link control (RLC) layer, and a medium accesscontrol (MAC) layer. The controller/processor 375 provides RRC layerfunctionality associated with broadcasting of system information (e.g.,MIB, SIBs), RRC connection control (e.g., RRC connection paging, RRCconnection establishment, RRC connection modification, and RRCconnection release), inter radio access technology (RAT) mobility, andmeasurement configuration for UE measurement reporting; PDCP layerfunctionality associated with header compression/decompression, security(ciphering, deciphering, integrity protection, integrity verification),and handover support functions; RLC layer functionality associated withthe transfer of upper layer packet data units (PDUs), error correctionthrough ARQ, concatenation, segmentation, and reassembly of RLC servicedata units (SDUs), re-segmentation of RLC data PDUs, and reordering ofRLC data PDUs; and MAC layer functionality associated with mappingbetween logical channels and transport channels, multiplexing of MACSDUs onto transport blocks (TBs), demultiplexing of MAC SDUs from TBs,scheduling information reporting, error correction through HARQ,priority handling, and logical channel prioritization.

The transmit (TX) processor 316 and the receive (RX) processor 370implement layer 1 functionality associated with various signalprocessing functions. Layer 1, which includes a physical (PHY) layer,may include error detection on the transport channels, forward errorcorrection (FEC) coding/decoding of the transport channels,interleaving, rate matching, mapping onto physical channels,modulation/demodulation of physical channels, and MIMO antennaprocessing. The TX processor 316 handles mapping to signalconstellations based on various modulation schemes (e.g., binaryphase-shift keying (BPSK), quadrature phase-shift keying (QPSK),M-phase-shift keying (M-PSK), M-quadrature amplitude modulation(M-QAM)). The coded and modulated symbols may then be split intoparallel streams. Each stream may then be mapped to an OFDM subcarrier,multiplexed with a reference signal (e.g., pilot) in the time and/orfrequency domain, and then combined together using an Inverse FastFourier Transform (IFFT) to produce a physical channel carrying a timedomain OFDM symbol stream. The OFDM stream is spatially precoded toproduce multiple spatial streams. Channel estimates from a channelestimator 374 may be used to determine the coding and modulation scheme,as well as for spatial processing. The channel estimate may be derivedfrom a reference signal and/or channel condition feedback transmitted bythe UE 350. Each spatial stream may then be provided to a differentantenna 320 via a separate transmitter 318TX. Each transmitter 318TX maymodulate an RF carrier with a respective spatial stream fortransmission.

At the UE 350, each receiver 354RX receives a signal through itsrespective antenna 352. Each receiver 354RX recovers informationmodulated onto an RF carrier and provides the information to the receive(RX) processor 356. The TX processor 368 and the RX processor 356implement layer 1 functionality associated with various signalprocessing functions. The RX processor 356 may perform spatialprocessing on the information to recover any spatial streams destinedfor the UE 350. If multiple spatial streams are destined for the UE 350,they may be combined by the RX processor 356 into a single OFDM symbolstream. The RX processor 356 then converts the OFDM symbol stream fromthe time-domain to the frequency domain using a Fast Fourier Transform(FFT). The frequency domain signal comprises a separate OFDM symbolstream for each subcarrier of the OFDM signal. The symbols on eachsubcarrier, and the reference signal, are recovered and demodulated bydetermining the most likely signal constellation points transmitted bythe base station 310. These soft decisions may be based on channelestimates computed by the channel estimator 358. The soft decisions arethen decoded and deinterleaved to recover the data and control signalsthat were originally transmitted by the base station 310 on the physicalchannel. The data and control signals are then provided to thecontroller/processor 359, which implements layer 3 and layer 2functionality.

The controller/processor 359 can be associated with a memory 360 thatstores program codes and data. The memory 360 may be referred to as acomputer-readable medium. In the UL, the controller/processor 359provides demultiplexing between transport and logical channels, packetreassembly, deciphering, header decompression, and control signalprocessing to recover IP packets from the EPC 160. Thecontroller/processor 359 is also responsible for error detection usingan ACK and/or NACK protocol to support HARQ operations.

Similar to the functionality described in connection with the DLtransmission by the base station 310, the controller/processor 359provides RRC layer functionality associated with system information(e.g., MIB, SIBs) acquisition, RRC connections, and measurementreporting; PDCP layer functionality associated with headercompression/decompression, and security (ciphering, deciphering,integrity protection, integrity verification); RLC layer functionalityassociated with the transfer of upper layer PDUs, error correctionthrough ARQ, concatenation, segmentation, and reassembly of RLC SDUs,re-segmentation of RLC data PDUs, and reordering of RLC data PDUs; andMAC layer functionality associated with mapping between logical channelsand transport channels, multiplexing of MAC SDUs onto TBs,demultiplexing of MAC SDUs from TBs, scheduling information reporting,error correction through HARQ, priority handling, and logical channelprioritization.

Channel estimates derived by a channel estimator 358 from a referencesignal or feedback transmitted by the base station 310 may be used bythe TX processor 368 to select the appropriate coding and modulationschemes, and to facilitate spatial processing. The spatial streamsgenerated by the TX processor 368 may be provided to different antenna352 via separate transmitters 354TX. Each transmitter 354TX may modulatean RF carrier with a respective spatial stream for transmission.

The UL transmission is processed at the base station 310 in a mannersimilar to that described in connection with the receiver function atthe UE 350. Each receiver 318RX receives a signal through its respectiveantenna 320. Each receiver 318RX recovers information modulated onto anRF carrier and provides the information to a RX processor 370.

The controller/processor 375 can be associated with a memory 376 thatstores program codes and data. The memory 376 may be referred to as acomputer-readable medium. In the UL, the controller/processor 375provides demultiplexing between transport and logical channels, packetreassembly, deciphering, header decompression, control signal processingto recover IP packets from the UE 350. IP packets from thecontroller/processor 375 may be provided to the EPC 160. Thecontroller/processor 375 is also responsible for error detection usingan ACK and/or NACK protocol to support HARQ operations.

At least one of the TX processor 368, the RX processor 356, and thecontroller/processor 359 may be configured to perform aspects inconnection with communication component 198 of FIG. 1 .

At least one of the TX processor 316, the RX processor 370, and thecontroller/processor 375 may be configured to perform aspects inconnection with communication component 199 of FIG. 1 .

Referring to FIGS. 4-6 , the described features generally relate toimproved resource selection for semi-persistent scheduling (SPS) infifth generation new radio (5G NR) vehicle-to-everything (V2X). Forexample in 3GPP Release 14 Specification, in SPS mode, a UE may select aresource at time m and reserve the resource with a periodicity p.Accordingly, the UE may use resources m, m+p, m+2p, etc., and until theUE decides to reselect. Currently, Release 14 requires that if anotherUE (e.g., a second UE) transmits at a resource in time n with aperiodicity q, the first UE needs to assume that all resources at n,n+q, n+2q, etc. are reserved. Therefore, the first UE is restricted fromselecting any resource that overlaps with those of the second UE so asto prevent collisions and/or interference. In some instances, if p and qare different then a large number of potential resources may beeliminated from use for reservation. In another instance, if p and q arecoprime, then all potential resources are eliminated from reservation.

In 5G NR, a UE may be configured for V2X communications, such as asidelink communication with another UE. For example, a UE may beconfigured by higher layers with one or more sidelink resource pools. Asidelink resource pool may be for transmission of physical sidelinkshared channel (PSSCH), or for reception of PSSCH. Each PSSCHtransmission is associated with a physical sidelink control channel(PSCCH) transmission. That PSCCH transmission carries the 1^(st) stageof the sidelink control information (SCI) associated with the PSSCHtransmission and the 2^(nd) stage of the associated SCI is carriedwithin the resource of the PSSCH. If the UE transmits SCI format 0-1 onPSCCH according to a PSCCH resource configuration in slot n and PSCCHresource m, then for the associated PSSCH transmission in the same slotone transport block is transmitted with up to two layers.

In an aspect, the UE may transmit the PSSCH in the same slot as theassociated PSCCH. The minimum resource allocation unit in the timedomain is a slot. The UE may transmit the PSSCH in consecutive symbolswithin the slot, subject to the following restrictions: the UE may nottransmit PSSCH in symbols which are not configured for sidelink. Asymbol is configured for sidelink, according to higher layer parametersstartSLsymbols and lengthSLsymbols, where startSLsymbols is the symbolindex of the first symbol of lengthSLsymbols consecutive symbolsconfigured for sidelink; within the slot, PSSCH resource allocationstarts at symbol startSLsymbols+1; the UE may not transmit PSSCH insymbols which are configured for use by PSFCH, if PSFCH is configured inthis slot; the UE may not transmit PSSCH in the last symbol configuredfor sidelink; and the UE may not transmit PSSCH in the symbolimmediately preceding the symbols which are configured for use by PSFCH,if PSFCH is configured in this slot.

The present disclosure relates generally to current issues of reservingresources for V2X communications. For example, in an aspect, the presentdisclosure includes a method, apparatus, and non-statutory computerreadable medium for wireless communications for receiving, by a first UEfrom one or more second UEs via a control channel, one or more reservedresources in time associated with any of the one or more second UE;determining, by the first UE, one or more transmission resources toreserve based on the one or more reserved resources in time; andtransmitting, by the first UE to the one or more second UEs, data usingthe one or more reserved transmission resources.

FIG. 4 is a flowchart 400 of a method of wireless communication. Themethod may be performed by a UE (e.g., the UE 104; the apparatus 350;the controller/processor 359, which may include the memory 360,processor(s) 512, which may include the memory 516, modem 540 and whichmay be the entire UE 104 or a component of the UE 104, such as the TXprocessor 368, the RX processor 356, and/or the transceiver 502) incombination with the communication component 198/configuration component240.

At 402, method 400 includes receiving, by a first user equipment (UE)from one or more second UEs via a control channel, one or more reservedresources in time associated with any of the one or more second UE. Inan aspect, the UE 104 and/or the communication component198/configuration component 240 may be configured to receive from one ormore second UEs via a control channel, one or more reserved resources intime associated with any of the one or more second UE. As such, the UE104 and/or the communication component 198/configuration component 240,e.g., in conjunction with controller/processor 359, which may includethe memory 360, processor(s) 512, which may include the memory 516,modem 540, TX processor 368, and transceiver 502 may define a means forreceiving, by a first UE from one or more second UEs via a controlchannel, one or more reserved resources in time associated with any ofthe one or more second UE.

At 404, method 400 includes determining, by the first UE, one or moretransmission resources to reserve based on the one or more reservedresources in time. In an aspect, the UE 104 and/or the communicationcomponent 198/configuration component 240 may be configured to determineone or more transmission resources to reserve based on the one or morereserved resources in time. As such, the UE 104 and/or the communicationcomponent 198/configuration component 240, e.g., in conjunction withcontroller/processor 359, which may include the memory 360, processor(s)512, which may include the memory 516, modem 540, RX processor 356, andtransceiver 502 may define a means for determining, by the first UE, oneor more transmission resources to reserve based on the one or morereserved resources in time.

For example in method 400, the UE 104 and/or the communication component198/configuration component 240 configured for determining the one ormore transmission resources to reserve further comprises establishingthat the first UE and the one or more second UEs are configured toreserve a single resource in time; and calculating a subsequent reservedtransmission resource associated with the first UE based on avoiding anoverlap in time with the one or more reserved resources associated withthe one or more second UEs. In an example, two types of reservationsoccur: periodic and aperiodic. For aperiodic reservations, the UE mayexplicitly reserve more than one resource in the future to transmit. Forperiodic reservations, the UE may signal periodicity to signal that theaperiodic reservation above is repeated periodically.

In another example method 400, the UE 104 and/or the communicationcomponent 198/configuration component 240 may be configured forreceiving, by the first UE from the one or more second UEs via thecontrol channel, a periodicity value associated with the reservedresource in time. In this example, determining the one or more resourcesto reserve further comprises determining that all resources includingthe reserved resource and additional resources based on the periodicityvalue are reserved; and calculating one or more subsequent selectedreserved transmission resources associated with the first UE based onavoiding an overlap in time with any of the reserved resource andadditional resources associated with the one or more second UEs. In someinstances, a number of the one or more subsequent reserved transmissionresources is at least one of preconfigured or adjustable.

In an instance, the UE 104 and/or the communication component198/configuration component 240 configured for transmitting the datausing the one or more selected reserved resources further comprisestransmitting the data using the one or more subsequent reservedtransmission resources. For example, the UE 104 and/or the communicationcomponent 198/configuration component 240 may be configured to determinewhether a collision is detected between the subsequent reservedtransmission resource and any of the one or more reserved resources;discard the one or more subsequent reserved transmission resources upontransmission of the data based on a determination that the collision isdetected between the subsequent reserved transmission resource and anyof the one or more reserved resources; and reselect to a new reservedtransmission resource in response to discarding the one or moresubsequent reserved transmission resources. In another example, the UE104 and/or the communication component 198/configuration component 240may be configured to determine whether a collision is detected betweenthe subsequent reserved transmission resource and any of the one or morereserved resources; and maintain the subsequent reserved transmissionresource based on a determination that the collision is not detectedbetween the subsequent reserved transmission resource and any of the oneor more reserved resources.

At 406, method 400 includes transmitting, by the first UE to the one ormore second UEs, data using the one or more reserved transmissionresources. In an aspect, the UE 104 and/or the communication component198/configuration component 240 may be configured to transmit, to theone or more second UEs, data using the one or more reserved transmissionresources. As such, the UE 104 and/or the communication component198/configuration component 240, e.g., in conjunction withcontroller/processor 359, which may include the memory 360, processor(s)512, which may include the memory 516, modem 540, RX processor 356, andtransceiver 502 may define a means for transmitting, by the first UE tothe one or more second UEs, data using the one or more reservedtransmission resources.

In an example of method 400, the UE 104 and/or the communicationcomponent 198/configuration component 240 configured for transmittingthe data using the one or more reserved resources further comprisestransmitting the data using the subsequent reserved transmissionresource. Further, the UE 104 and/or the communication component198/configuration component 240 may be configured to determine whether acollision is detected between the subsequent reserved transmissionresource and any of the one or more reserved resources; and discard thesubsequent reserved transmission resource upon transmission of the databased on a determination that the collision is detected between thesubsequent reserved transmission resource and any of the one or morereserved resources, wherein the subsequent reserved transmissionresource is configured to single use. In another example, the UE 104and/or the communication component 198/configuration component 240 maybe configured to determine whether a collision is detected between thesubsequent reserved transmission resource and any of the one or morereserved resources; and maintain the subsequent reserved transmissionresource based on a determination that the collision is not detectedbetween the subsequent reserved transmission resource and any of the oneor more reserved resources

In another example of method 400, the UE 104 and/or the communicationcomponent 198/configuration component 240 may be configured to receive,from the one or more second UEs via the control channel, a periodicityvalue associated with the one or more reserved resources in time and anotification indicating a number of instances to maintain the one ormore reserved resources associated with the one or more second UEs.Further in method 400, the UE 104 and/or the communication component198/configuration component 240 configured for determining the one ormore resources to reserve further comprises selecting a second reservedresource and a second periodicity value, wherein each of the secondreserved resource and the second periodicity value differ from the oneor more reserved resources and periodicity value to avoid an overlap intime; and selecting a number of instances to maintain the secondreserved resource, wherein the second reserved resource avoids collisionwith any of the one or more reserved resources.

In an example of method 400, the UE 104 and/or the communicationcomponent 198/configuration component 240 configured for transmittingthe data using the one or more reserved resources further comprisestransmitting the data using the second reserved resource and the secondperiodicity value based on the number of instances to maintain thesecond reserved resource.

In an example of method 400, the number of instances to maintain thesecond reserved resource is adjustable.

In an example of method 400, the UE 104 and/or the communicationcomponent 198/configuration component 240 configured for determining theone or more resources to reserve further comprises determining athreshold value for the number of instances; determining that a numberof available resources for reservation fails to satisfy the thresholdvalue; decreasing a value of a number of instances to maintain a secondreserved resource based on a determination that the number of availableresources for reservation fails to satisfy the threshold.

In an example of method 400, the UE 104 and/or the communicationcomponent 198/configuration component 240 configured for determining theone or more resources to reserve further comprises ranking one or moreavailable resources for reservation based on a number of times each ofthe one or more available resources will be available in futureinstances; and selecting the one or more available resources forreservation based on the ranking.

In an example of method 400, the control channel corresponds to aphysical sidelink control channel (PSCCH).

In an example method 400, the UE 104 and/or the communication component198/configuration component 240 may be configured for receiving, by thefirst UE from the one or more second UEs via the control channel, anoffset value corresponding to a distance in time between an old resourceand a new resource; and wherein determining the one or more resources toreserve further comprises determining the one or more resources toreserve based on the offset.

Referring to FIG. 5 , one example of an implementation of UE 104 mayinclude a variety of components, some of which have already beendescribed above and are described further herein, including componentssuch as one or more processors 512 and memory 516 and transceiver 502 incommunication via one or more buses 544, which may operate inconjunction with modem 540 and/or communication component 198 forimproved resource selection for SPS in 5G NR V2X.

In an aspect, the one or more processors 512 can include a modem 540and/or can be part of the modem 540 that uses one or more modemprocessors. Thus, the various functions related to communicationcomponent 198 may be included in modem 540 and/or processors 512 and, inan aspect, can be executed by a single processor, while in otheraspects, different ones of the functions may be executed by acombination of two or more different processors. For example, in anaspect, the one or more processors 512 may include any one or anycombination of a modem processor, or a baseband processor, or a digitalsignal processor, or a transmit processor, or a receiver processor, or atransceiver processor associated with transceiver 502. In other aspects,some of the features of the one or more processors 512 and/or modem 540associated with communication component 198 may be performed bytransceiver 502.

Also, memory 516 may be configured to store data used herein and/orlocal versions of applications 575 or communicating component 198 and/orone or more of the subcomponents being executed by at least oneprocessor 512. Memory 516 can include any type of computer-readablemedium usable by a computer or at least one processor 512, such asrandom access memory (RAM), read only memory (ROM), tapes, magneticdiscs, optical discs, volatile memory, non-volatile memory, and anycombination thereof. In an aspect, for example, memory 516 may be anon-transitory computer-readable storage medium that stores one or morecomputer-executable codes defining communication component 198 and/orone or more of its subcomponents, and/or data associated therewith, whenUE 104 is operating at least one processor 512 to execute communicationcomponent 198 and/or one or more of its subcomponents.

Transceiver 502 may include at least one receiver 506 and at least onetransmitter 508. Receiver 506 may include hardware and/or softwareexecutable by a processor for receiving data, the code comprisinginstructions and being stored in a memory (e.g., computer-readablemedium). Receiver 506 may be, for example, a radio frequency (RF)receiver. In an aspect, receiver 506 may receive signals transmitted byat least one base station 102. Additionally, receiver 506 may processsuch received signals, and also may obtain measurements of the signals,such as, but not limited to, Ec/Io, signal-to-noise ratio (SNR),reference signal received power (RSRP), received signal strengthindicator (RSSI), etc. Transmitter 508 may include hardware and/orsoftware executable by a processor for transmitting data, the codecomprising instructions and being stored in a memory (e.g.,computer-readable medium). A suitable example of transmitter 508 mayincluding, but is not limited to, an RF transmitter.

Moreover, in an aspect, UE 104 may include RF front end 588, which mayoperate in communication with one or more antennas 565 and transceiver502 for receiving and transmitting radio transmissions, for example,wireless communications transmitted by at least one base station 102 orwireless transmissions transmitted by UE 104. RF front end 588 may beconnected to one or more antennas 565 and can include one or morelow-noise amplifiers (LNAs) 590, one or more switches 592, one or morepower amplifiers (PAs) 598, and one or more filters 596 for transmittingand receiving RF signals.

In an aspect, LNA 590 can amplify a received signal at a desired outputlevel. In an aspect, each LNA 590 may have a specified minimum andmaximum gain values. In an aspect, RF front end 588 may use one or moreswitches 592 to select a particular LNA 590 and its specified gain valuebased on a desired gain value for a particular application.

Further, for example, one or more PA(s) 598 may be used by RF front end588 to amplify a signal for an RF output at a desired output powerlevel. In an aspect, each PA 598 may have specified minimum and maximumgain values. In an aspect, RF front end 588 may use one or more switches592 to select a particular PA 598 and its specified gain value based ona desired gain value for a particular application.

Also, for example, one or more filters 596 can be used by RF front end588 to filter a received signal to obtain an input RF signal. Similarly,in an aspect, for example, a respective filter 596 can be used to filteran output from a respective PA 598 to produce an output signal fortransmission. In an aspect, each filter 596 can be connected to aspecific LNA 590 and/or PA 598. In an aspect, RF front end 588 can useone or more switches 592 to select a transmit or receive path using aspecified filter 596, LNA 590, and/or PA 598, based on a configurationas specified by transceiver 502 and/or processor 512.

As such, transceiver 502 may be configured to transmit and receivewireless signals through one or more antennas 565 via RF front end 588.In an aspect, transceiver may be tuned to operate at specifiedfrequencies such that UE 104 can communicate with, for example, one ormore base stations 102 or one or more cells associated with one or morebase stations 102. In an aspect, for example, modem 540 can configuretransceiver 502 to operate at a specified frequency and power levelbased on the UE configuration of the UE 104 and the communicationprotocol used by modem 540.

In an aspect, modem 540 can be a multiband-multimode modem, which canprocess digital data and communicate with transceiver 502 such that thedigital data is sent and received using transceiver 502. In an aspect,modem 540 can be multiband and be configured to support multiplefrequency bands for a specific communications protocol. In an aspect,modem 540 can be multimode and be configured to support multipleoperating networks and communications protocols. In an aspect, modem 540can control one or more components of UE 104 (e.g., RF front end 588,transceiver 502) to enable transmission and/or reception of signals fromthe network based on a specified modem configuration. In an aspect, themodem configuration can be based on the mode of the modem and thefrequency band in use. In another aspect, the modem configuration can bebased on UE configuration information associated with UE 104 as providedby the network during cell selection and/or cell reselection.

In an aspect, the processor(s) 512 may correspond to one or more of theprocessors described in connection with the UE in FIG. 3 . Similarly,the memory 516 may correspond to the memory described in connection withthe UE in FIG. 3 .

Referring to FIG. 6 , one example of an implementation of base station102 (e.g., a base station 102, as described above) may include a varietyof components, some of which have already been described above, butincluding components such as one or more processors 612 and memory 616and transceiver 602 in communication via one or more buses 644, whichmay operate in conjunction with modem 640 and communication component199 for communicating reference signals.

The transceiver 602, receiver 606, transmitter 608, one or moreprocessors 612, memory 616, applications 675, buses 644, RF front end688, LNAs 690, switches 692, filters 696, PAs 698, and one or moreantennas 665 may be the same as or similar to the correspondingcomponents of UE 104, as described above, but configured or otherwiseprogrammed for base station operations as opposed to UE operations.

In an aspect, the processor(s) 612 may correspond to one or more of theprocessors described in connection with the base station in FIG. 3 .Similarly, the memory 616 may correspond to the memory described inconnection with the base station in FIG. 3 .

Some Further Example Clauses

Implementation examples are described in the following numbered clauses:

-   -   1. A method of wireless communication, comprising:    -   receiving, by a first user equipment (UE) from one or more        second UEs via a control channel, one or more reserved resources        in time associated with any of the one or more second UE;    -   determining, by the first UE, one or more transmission resources        to reserve based on the one or more reserved resources in time;        and    -   transmitting, by the first UE to the one or more second UEs,        data using the one or more reserved transmission resources.    -   2. The method of clause 1, wherein determining the one or more        transmission resources to reserve further comprises:    -   establishing that the first UE and the one or more second UEs        are configured to reserve a single resource in time; and    -   calculating a subsequent reserved transmission resource        associated with the first UE based on avoiding an overlap in        time with the one or more reserved resources associated with the        one or more second UEs.    -   3. The method of any preceding clause, further comprising        receiving, by the first UE from the one or more second UEs via        the control channel, a periodicity value associated with the        reserved resource in time.    -   4. The method of any preceding clause, wherein determining the        one or more resources to reserve further comprises:    -   determining that all resources including the reserved resource        and additional resources based on the periodicity value are        reserved; and    -   calculating one or more subsequent reserved transmission        resources associated with the first UE based on avoiding an        overlap in time with any of the reserved resource and additional        resources associated with the one or more second UEs.    -   5. The method of any preceding clause, wherein a number of the        one or more subsequent reserved transmission resources is at        least one of preconfigured or adjustable.    -   6. The method of any preceding clause, wherein transmitting the        data using the one or more reserved resources further comprises        transmitting the data using the one or more subsequent reserved        transmission resources.    -   7. The method of any preceding clause, further comprising:    -   determining whether a collision is detected between the one or        more subsequent reserved transmission resources and any of the        one or more reserved resources;    -   discarding the one or more subsequent reserved transmission        resources upon transmission of the data based on a determination        that the collision is detected between the subsequent reserved        transmission resource and any of the one or more reserved        resources; and    -   reselecting to a new reserved transmission resource in response        to discarding the one or more subsequent reserved transmission        resources.    -   8. The method of any preceding clause, further comprising:    -   determining whether a collision is detected between the        subsequent reserved transmission resource and any of the one or        more reserved resources; and    -   maintaining the subsequent reserved transmission resource based        on a determination that the collision is not detected between        the subsequent reserved transmission resource and any of the one        or more reserved resources.    -   9. The method of any preceding clause, wherein transmitting the        data using the one or more reserved resources further comprises        transmitting the data using the subsequent reserved transmission        resource.    -   10. The method of any preceding clause, further comprising:    -   determining whether a collision is detected between the        subsequent reserved transmission resource and any of the one or        more reserved resources; and    -   discarding the subsequent reserved transmission resource upon        transmission of the data based on a determination that the        collision is detected between the subsequent reserved        transmission resource and any of the one or more reserved        resources, wherein the subsequent reserved transmission resource        is configured to single use.    -   11. The method of any preceding clause, further comprising:    -   determining whether a collision is detected between the        subsequent reserved transmission resource and any of the one or        more reserved resources; and    -   maintaining the subsequent reserved transmission resource based        on a determination that the collision is not detected between        the subsequent reserved transmission resource and any of the one        or more reserved resources.    -   12. The method of any preceding clause, further comprising        receiving, by the first UE from the one or more second UEs via        the control channel, a periodicity value associated with the one        or more reserved resources in time and a notification indicating        a number of instances to maintain the one or more reserved        resources associated with the one or more second UEs.    -   13. The method of any preceding clause, wherein determining the        one or more resources to reserve further comprises:    -   selecting a second reserved resource and a second periodicity        value, wherein each of the second reserved resource and the        second periodicity value differ from the one or more reserved        resources and periodicity value to avoid an overlap in time; and    -   selecting a number of instances to maintain the second reserved        resource, wherein the second reserved resource avoids collision        with any of the one or more reserved resources.    -   14. The method of any preceding clause, wherein transmitting the        data using the one or more reserved resources further comprises        transmitting the data using the second reserved resource and the        second periodicity value based on the number of instances to        maintain the second reserved resource.    -   15. The method of any preceding clause, wherein the number of        instances to maintain the second reserved resource is        adjustable.    -   16. The method of any preceding clause, wherein determining the        one or more resources to reserve further comprises:    -   determining a threshold value for the number of instances;    -   determining that a number of available resources for reservation        fails to satisfy the threshold value;    -   decreasing a value of a number of instances to maintain a second        reserved resource based on a determination that the number of        available resources for reservation fails to satisfy the        threshold.    -   17. The method of any preceding clause, wherein determining the        one or more resources to reserve further comprises:    -   ranking one or more available resources for reservation based on        a number of times each of the one or more available resources        will be available in future instances; and    -   selecting the one or more available resources for reservation        based on the ranking.    -   18. The method of any preceding clause, wherein the control        channel corresponds to a physical sidelink control channel        (PSCCH).    -   19. The method of any preceding clause, further comprising        receiving, by the first UE from the one or more second UEs via        the control channel, an offset value corresponding to a distance        in time between an old resource and a new resource; and    -   wherein determining the one or more resources to reserve further        comprises determining the one or more resources to reserve based        on the offset.    -   20. An apparatus for wireless communication, comprising:    -   a transceiver;    -   a memory configured to store instructions; and    -   one or more processors communicatively coupled with the        transceiver and the memory, wherein the one or more processors        are configured to:        -   receive, by a first user equipment (UE) from one or more            second UEs via a control channel, one or more reserved            resources in time associated with any of the one or more            second UE;        -   determine, by the first UE, one or more transmission            resources to reserve based on the one or more reserved            resources in time; and        -   transmit, by the first UE to the one or more second UEs,            data using the one or more reserved transmission resources.    -   21. The apparatus of clause 20, wherein the one or more        processors configured to determine the one or more transmission        resources to reserve are further configured to:    -   establish that the first UE and the one or more second UEs are        configured to reserve a single resource in time; and    -   calculate a subsequent reserved transmission resource associated        with the first UE based on avoiding an overlap in time with the        one or more reserved resources associated with the one or more        second UEs.    -   22. The apparatus of any preceding clause, wherein the one or        more processors are configured to receive, by the first UE from        the one or more second UEs via the control channel, a        periodicity value associated with the reserved resource in time.    -   23. The apparatus of any preceding clause, wherein the one or        more processors configured to determine the one or more        resources to reserve are further configured to:    -   determine that all resources including the reserved resource and        additional resources based on the periodicity value are        reserved; and    -   calculate one or more subsequent reserved transmission resources        associated with the first UE based on avoiding an overlap in        time with any of the reserved resource and additional resources        associated with the one or more second UEs, wherein a number of        the one or more subsequent reserved transmission resources is at        least one of preconfigured or adjustable, and    -   wherein transmitting the data using the one or more reserved        resources further comprises transmitting the data using the one        or more subsequent reserved transmission resources.    -   24. The apparatus of any preceding clause, wherein the one or        more processors configured to transmit the data using the one or        more reserved resources are further configured to transmit the        data using the subsequent reserved transmission resource.    -   25. The apparatus of any preceding clause, wherein the one or        more processors are configured to receive, by the first UE from        the one or more second UEs via the control channel, a        periodicity value associated with the one or more reserved        resources in time and a notification indicating a number of        instances to maintain the one or more reserved resources        associated with the one or more second UEs.    -   26. The apparatus of any preceding clause, wherein the one or        more processors configured to determine the one or more        resources to reserve are further configured to:    -   select a second reserved resource and a second periodicity        value, wherein each of the second reserved resource and the        second periodicity value differ from the one or more reserved        resources and periodicity value to avoid an overlap in time; and    -   select a number of instances to maintain the second reserved        resource, wherein the second reserved resource avoids collision        with any of the one or more reserved resources.    -   27. The apparatus of any preceding clause, wherein the control        channel corresponds to a physical sidelink control channel        (PSCCH).    -   28. The apparatus of any preceding clause, wherein the one or        more processors are configured to receive, by the first UE from        the one or more second UEs via the control channel, an offset        value corresponding to a distance in time between an old        resource and a new resource; and    -   wherein the one or more processors configured to determine the        one or more resources to reserve are further configured to        determine the one or more resources to reserve based on the        offset.    -   29. An apparatus for wireless communication, comprising:    -   means for receiving, by a first user equipment (UE) from one or        more second UEs via a control channel, one or more reserved        resources in time associated with any of the one or more second        UE;    -   means for determining, by the first UE, one or more transmission        resources to reserve based on the one or more reserved resources        in time; and    -   means for transmitting, by the first UE to the one or more        second UEs, data using the one or more reserved transmission        resources.    -   30. A non-transitory computer-readable medium, comprising code        executable by one or more processors to:    -   receive, by a first user equipment (UE) from one or more second        UEs via a control channel, one or more reserved resources in        time associated with any of the one or more second UE;    -   determine, by the first UE, one or more transmission resources        to reserve based on the one or more reserved resources in time;        and    -   transmit, by the first UE to the one or more second UEs, data        using the one or more reserved transmission resources.

It is understood that the specific order or hierarchy of blocks in theprocesses/flowcharts disclosed is an illustration of example approaches.Based upon design preferences, it is understood that the specific orderor hierarchy of blocks in the processes/flowcharts may be rearranged.Further, some blocks may be combined or omitted. The accompanying methodclaims present elements of the various blocks in a sample order, and arenot meant to be limited to the specific order or hierarchy presented.

The previous description is provided to enable any person skilled in theart to practice the various aspects described herein. Variousmodifications to these aspects will be readily apparent to those skilledin the art, and the generic principles defined herein may be applied toother aspects. Thus, the claims are not intended to be limited to theaspects shown herein, but is to be accorded the full scope consistentwith the language claims, wherein reference to an element in thesingular is not intended to mean “one and only one” unless specificallyso stated, but rather “one or more.” The word “exemplary” is used hereinto mean “serving as an example, instance, or illustration.” Any aspectdescribed herein as “exemplary” is not necessarily to be construed aspreferred or advantageous over other aspects. Unless specifically statedotherwise, the term “some” refers to one or more. Combinations such as“at least one of A, B, or C,” “one or more of A, B, or C,” “at least oneof A, B, and C,” “one or more of A, B, and C,” and “A, B, C, or anycombination thereof” include any combination of A, B, and/or C, and mayinclude multiples of A, multiples of B, or multiples of C. Specifically,combinations such as “at least one of A, B, or C,” “one or more of A, B,or C,” “at least one of A, B, and C,” “one or more of A, B, and C,” and“A, B, C, or any combination thereof” may be A only, B only, C only, Aand B, A and C, B and C, or A and B and C, where any such combinationsmay contain one or more member or members of A, B, or C. All structuraland functional equivalents to the elements of the various aspectsdescribed throughout this disclosure that are known or later come to beknown to those of ordinary skill in the art are expressly incorporatedherein by reference and are intended to be encompassed by the claims.Moreover, nothing disclosed herein is intended to be dedicated to thepublic regardless of whether such disclosure is explicitly recited inthe claims. The words “module,” “mechanism,” “element,” “device,” andthe like may not be a substitute for the word “means.” As such, no claimelement is to be construed as a means plus function unless the elementis expressly recited using the phrase “means for.”

What is claimed is:
 1. A method of wireless communication, comprising:receiving, by a first user equipment (UE) from one or more second UEsvia a control channel, one or more reserved resources in time associatedwith any of the one or more second UE; determining, by the first UE, oneor more transmission resources to reserve based on the one or morereserved resources in time, wherein determining the one or moretransmission resources to reserve further comprises: establishing thatthe first UE and the one or more second UEs are configured to reserve asingle resource in time; and calculating a subsequent reservedtransmission resource associated with the first UE based on avoiding anoverlap in time with the one or more reserved resources associated withthe one or more second UEs; and transmitting, by the first UE to the oneor more second UEs, data using the one or more reserved transmissionresources.
 2. The method of claim 1, further comprising receiving, bythe first UE from the one or more second UEs via the control channel, aperiodicity value associated with the single resource in time.
 3. Themethod of claim 2, wherein determining the one or more resources toreserve further comprises: determining that all resources including thesingle resource and additional resources based on the periodicity valueare reserved; and calculating one or more subsequent reservedtransmission resources associated with the first UE based on avoiding anoverlap in time with any of the single resource and additional resourcesassociated with the one or more second UEs.
 4. The method of claim 3,wherein a number of the one or more subsequent reserved transmissionresources is at least one of preconfigured or adjustable.
 5. The methodof claim 3, wherein transmitting the data using the one or more reservedresources further comprises transmitting the data using the one or moresubsequent reserved transmission resources.
 6. The method of claim 5,further comprising: determining whether a collision is detected betweenthe one or more subsequent reserved transmission resources and any ofthe one or more reserved resources; discarding the one or moresubsequent reserved transmission resources upon transmission of the databased on a determination that the collision is detected between thesubsequent reserved transmission resource and any of the one or morereserved resources; and reselecting to a new reserved transmissionresource in response to discarding the one or more subsequent reservedtransmission resources.
 7. The method of claim 5, further comprising:determining whether a collision is detected between the subsequentreserved transmission resource and any of the one or more reservedresources; and maintaining the subsequent reserved transmission resourcebased on a determination that the collision is not detected between thesubsequent reserved transmission resource and any of the one or morereserved resources.
 8. The method of claim 1, wherein transmitting thedata using the one or more reserved resources further comprisestransmitting the data using the subsequent reserved transmissionresource.
 9. The method of claim 8, further comprising: determiningwhether a collision is detected between the subsequent reservedtransmission resource and any of the one or more reserved resources; anddiscarding the subsequent reserved transmission resource upontransmission of the data based on a determination that the collision isdetected between the subsequent reserved transmission resource and anyof the one or more reserved resources, wherein the subsequent reservedtransmission resource is configured to single use.
 10. The method ofclaim 8, further comprising: determining whether a collision is detectedbetween the subsequent reserved transmission resource and any of the oneor more reserved resources; and maintaining the subsequent reservedtransmission resource based on a determination that the collision is notdetected between the subsequent reserved transmission resource and anyof the one or more reserved resources.
 11. The method of claim 1,further comprising receiving, by the first UE from the one or moresecond UEs via the control channel, a periodicity value associated withthe one or more reserved resources in time and a notification indicatinga number of instances to maintain the one or more reserved resourcesassociated with the one or more second UEs.
 12. The method of claim 11,wherein determining the one or more resources to reserve furthercomprises: selecting a second reserved resource and a second periodicityvalue, wherein each of the second reserved resource and the secondperiodicity value differ from the one or more reserved resources andperiodicity value to avoid an overlap in time; and selecting a number ofinstances to maintain the second reserved resource, wherein the secondreserved resource avoids collision with any of the one or more reservedresources.
 13. The method of claim 11, wherein transmitting the datausing the one or more reserved resources further comprises transmittingthe data using the second reserved resource and the second periodicityvalue based on the number of instances to maintain the second reservedresource.
 14. The method of claim 11, wherein the number of instances tomaintain the second reserved resource is adjustable.
 15. The method ofclaim 11, wherein determining the one or more resources to reservefurther comprises: determining a threshold value for the number ofinstances; determining that a number of available resources forreservation fails to satisfy the threshold value; and decreasing a valueof a number of instances to maintain a second reserved resource based ona determination that the number of available resources for reservationfails to satisfy the threshold.
 16. The method of claim 11, whereindetermining the one or more resources to reserve further comprises:ranking one or more available resources for reservation based on anumber of times each of the one or more available resources will beavailable in future instances; and selecting the one or more availableresources for reservation based on the ranking.
 17. The method of claim1, wherein the control channel corresponds to a physical sidelinkcontrol channel (PSCCH).
 18. The method of claim 1, further comprisingreceiving, by the first UE from the one or more second UEs via thecontrol channel, an offset value corresponding to a distance in timebetween an old resource and a new resource; and wherein determining theone or more resources to reserve further comprises determining the oneor more resources to reserve based on the offset.
 19. An apparatus forwireless communication, comprising: a transceiver; a memory configuredto store instructions; and one or more processors communicativelycoupled with the transceiver and the memory, wherein the one or moreprocessors are configured to: receive, by a first user equipment (UE)from one or more second UEs via a control channel, one or more reservedresources in time associated with any of the one or more second UE;determine, by the first UE, one or more transmission resources toreserve based on the one or more reserved resources in time, wherein theone or more processors configured to determine the one or moretransmission resources to reserve are further configured to: establishthat the first UE and the one or more second UEs are configured toreserve a single resource in time; and calculate a subsequent reservedtransmission resource associated with the first UE based on avoiding anoverlap in time with the one or more reserved resources associated withthe one or more second UEs; and transmit, by the first UE to the one ormore second UEs, data using the one or more reserved transmissionresources.
 20. The apparatus of claim 19, wherein the one or moreprocessors are configured to receive, by the first UE from the one ormore second UEs via the control channel, a periodicity value associatedwith the single resource in time.
 21. The apparatus of claim 20, whereinthe one or more processors configured to determine the one or moreresources to reserve are further configured to: determine that allresources including the single resource and additional resources basedon the periodicity value are reserved; and calculate one or moresubsequent reserved transmission resources associated with the first UEbased on avoiding an overlap in time with any of the single resource andadditional resources associated with the one or more second UEs, whereina number of the one or more subsequent reserved transmission resourcesis at least one of preconfigured or adjustable, and wherein the one ormore processors configured to transmit the data using the one or morereserved resources are further configured to transmit the data using theone or more subsequent reserved transmission resources.
 22. Theapparatus of claim 19, wherein the one or more processors configured totransmit the data using the one or more reserved resources are furtherconfigured to transmit the data using the subsequent reservedtransmission resource.
 23. The apparatus of claim 19, wherein the one ormore processors are configured to receive, by the first UE from the oneor more second UEs via the control channel, a periodicity valueassociated with the one or more reserved resources in time and anotification indicating a number of instances to maintain the one ormore reserved resources associated with the one or more second UEs. 24.The apparatus of claim 23, wherein the one or more processors configuredto determine the one or more resources to reserve are further configuredto: select a second reserved resource and a second periodicity value,wherein each of the second reserved resource and the second periodicityvalue differ from the one or more reserved resources and periodicityvalue to avoid an overlap in time; and select a number of instances tomaintain the second reserved resource, wherein the second reservedresource avoids collision with any of the one or more reservedresources.
 25. The apparatus of claim 19, wherein the control channelcorresponds to a physical sidelink control channel (PSCCH).
 26. Theapparatus of claim 19, wherein the one or more processors are configuredto receive, by the first UE from the one or more second UEs via thecontrol channel, an offset value corresponding to a distance in timebetween an old resource and a new resource; and wherein the one or moreprocessors configured to determine the one or more resources to reserveare further configured to determine the one or more resources to reservebased on the offset.
 27. An apparatus for wireless communication,comprising: means for receiving, by a first user equipment (UE) from oneor more second UEs via a control channel, one or more reserved resourcesin time associated with any of the one or more second UE; means fordetermining, by the first UE, one or more transmission resources toreserve based on the one or more reserved resources in time, wherein themeans for determining the one or more transmission resources to reservefurther comprises: means for establishing that the first UE and the oneor more second UEs are configured to reserve a single resource in time;and means for calculating a subsequent reserved transmission resourceassociated with the first UE based on avoiding an overlap in time withthe one or more reserved resources associated with the one or moresecond UEs; and means for transmitting, by the first UE to the one ormore second UEs, data using the one or more reserved transmissionresources.
 28. A non-transitory computer-readable medium, comprisingcode executable by one or more processors to: receive, by a first userequipment (UE) from one or more second UEs via a control channel, one ormore reserved resources in time associated with any of the one or moresecond UE; determine, by the first UE, one or more transmissionresources to reserve based on the one or more reserved resources intime, wherein determining the one or more transmission resources toreserve further comprises: establish that the first UE and the one ormore second UEs are configured to reserve a single resource in time; andcalculate a subsequent reserved transmission resource associated withthe first UE based on avoiding an overlap in time with the one or morereserved resources associated with the one or more second UEs; andtransmit, by the first UE to the one or more second UEs, data using theone or more reserved transmission resources.